'declare' originates from Latin, specifically the word 'declarare,' where 'de-' meant 'thoroughly' and 'clarare' meant 'to make clear.'

'declarare' transformed into the Old French word 'declarer,' and eventually became the modern English word 'declare' through Middle English.

Initially, it meant 'to make clear or explain,' but over time it evolved into its current meaning of 'to announce formally.'